Radiation-Tolerant Delta-Sigma Time-to-Digital Converters by Ying Cao Paul Leroux & Michiel Steyaert

Author:Ying Cao, Paul Leroux & Michiel Steyaert
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

and are two primary contributors to the relaxation oscillator’s jitter . The latter is generally the dominant cause of jitter, due to its much larger contributing bandwidth [3, 32]. Thus, the output code of the first-order TDC can be described as:

(4.7)

where S is the charging slop of the capacitor. Therefore, apart from the noise-shaped quantization error, two additional noises also appear at the TDC’s output. In order to derive the design specification of the TDC more accurately, it is important to know the impact of those two noise sources on the TDC’s overall performance. Quantitative calculations of the TDC’s SNR determined by the oscillator jitter and phase skew error, respectively, are stated below.

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